Improvement in harrows



i UNITED STATES PATENT OEEICE.

JONATHAN AYERS, OF OANTERBURY, NEW HAMPSHIRE.

IMPROVEMENT IN HARRows.

Specification forming part of Letters Patent No. 56,159, dated Julyr 10, 1866.

To all whom it may concern;

Be it known that I, JONATHAN AYEEs, of Canterbury, in the county of Merrimac and State of New Hampshire, have invented a new and useful Improvement in Harrows; and I do hereby declare the same to be fully described in the following specification and represented in the accompanying drawings, of which- Figure 1 is a side elevation, and Fig. 2 an under-side View, of a harrow provided with my invention. Fig. 3 is a front view, Fig. 4 a rear elevation, and Fig. 5 a transverse section, of one of its teeth.

Each dank-tooth is made with a knifefedge to enter the ground, a curved lip to pass underneath and turn up the ground, and. another bend or curve to throw it over, as does the mold-board of a plow.

In the drawings, A is the barrow-frame, made in the ordinary manner. B is the first or front tooth, provided with two wings, g g, and two fastening-lips, l Z. C O O are the flank or single-winged teeth, each of the latter being formed as a plate provided with two lips, a, a, for securing it to the frame by screws going through such lips. Each of such teeth has its front an inclined knife-edge7 b,

from which a Wing projects and is curved two ways-viz., as shown at c and d. Vhen the harrow is in use the knifeedge cuts vertically into the soil with a drawing stroke. The lip or part c goes laterally underneath the soil and turns it up, and the part d subsequently throws it over or turns it, as does the moldboard of a plow.

` The.` several ilaukteeth are arranged at equal or about equal distances apart on each wing of the barrow-frame. The irst or front tooth has but one inclined knife-edge, f, each of its wings being formed with two curves, h t', so as to operate in the saine manner in which a wing of each of the other teeth acts.

I claim- 1. The front tooth, B, as made with the inclined knife-edgef and the two double-curved Wings g g, asset forth.

2. Each lateral tooth as made with the knife edge b and the curved furrow-opening lip c and the curved furrowturning lip or part d, arranged as specified.

JONATHAN AYERS.

Witnesses R. H. EDDY,

SAMUEL N. PIPER. 

